Can i add custom code in Source in specific page, Header from function.php?

there are many plugins that do some job but can i add custom code per page? Also i mean specific code by pages,posts? with function.php? For example, that code will appear every page:

function hook_link() {
    ?
        link href="http://buhehe.de/wp-content/uploads/2017/12/Buhehe.ico" rel="shortcut icon" type="image/x-icon"
    ?php
}
add_action('wp_head', 'hook_link');

Can i make something like this with function.php for every page customed and specified?

Topic php plugins Wordpress

Category Web

1
answered at

You can add conditions in you function if you want to add icons like this method you mentioned in question.

function hook_link() {

  global $post;
  if ($post->post_type == 'page' && $post->ID == 'whatever page id') {
    echo '<link href="http://buhehe.de/wp-content/uploads/2017/12/Buhehe.ico" rel="shortcut icon" type="image/x-icon">';
  }
  ?>

  <?php
}

add_action('wp_head', 'hook_link');

to check page or post etc you can use is_page() and is_single() functions.

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